Electric heater



E. MILLNER ELECTRIC HEATER I April 6 1926. 1,579,882

Filed August 2, 1919 Patented Apr. 6, 1926.

UNITED STATES EDGAR MILLNER, OF ST. LOUIS, MISSOURI.

ELECTRIC HEATER.

Application filed August, 2, 1919. Serial No. 314,868.

To all whom it may concern:

Be it known that I, EDGAR MILLNER, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented acertain new and useful Improverent in Electric Heaters, of which the following is a specification, reference being had to the accompanying drawing, forming part thereof.

This invention relates to a certain new and useful improvement in electric heaters.

The principal object of my present inven tion is to provide an efficient electric heater comprising a heating-element or unit and a heat-radiating casing or housing for the element of few readily assembled and complementing sections, so constructed and co-operating with each other and with the heatingelement that the several parts may, with facility and convenience, be taken apart or separated and a renewal or substitution of the heating-element readily made.

With the above and other objects in view, my present invention resides in'the novel features of form,construction, arrangement,

and combination of parts hereinafter described and afterwards pointed out in the claims.

In the accompanying drawing,.

Figures 1 and 2 are plan and side elevational views, respectively, of the heating-unit or element;

Figure 3 is an enlarged fragmental longitudinal sectional view of one of the legs of the heating-unit or element; 7

Figure 4i isan enlarged transverse sectional view of one ofthe legs of the heatingunit or element taken approximately on the line Jr-4, Figure 2;

Figure 5 is an. elevational view of an ironing device equipped with an electric heater embodying my invention; Figures 6 and 7 are side elevational views of the co-operating and interlocking members or sections of the housing or casing of the heater;

Figures 8 and 9 are end views of the casing-members illustrated in Figures 6 and 7, respectively; and

Figure 10 is a transverse sectional view of the casing of the heater, the heating-unit or element being omitted.

Referring now more particularly to the said drawing, in which like reference characters refer to like parts throughout the several views, the heat-radiating housing or sections A and B adapted for co-operationand interlocking with each other.

The housing or casing section A comprises preferably integrally a pair of oppositely disposed. longitudinal. wall-members 1-1 and a longitudinal connecting-web 2 disposed therebetween to provide the section A with oppositely disposed longitudinal recesses 8 3. The web 2 is cut away at one or its forward end, as at A, and at its other or rear end is reduced in length relatively to the walls 1 to provide-the section A with a rear end recess, as at 5,- all for purposes hereinafter appearing. Fixed to or integral with the forward ends of the walls 1 and forming part of the section A, is a disk 6. Extending in fixed position transversely through, and insulated from, the disk 6, is a pair of binding-posts or terminals, 7 adapted for connection with the line wires of the circuit. Each of the posts 7 is bifurcated or forked at its inner end, as at 8, the posts 7 being so positioned in the disk 6 relatively to the web 2 that their bifurcations 8 are disposed in planes approximately parallel with, but spaced from, the opposite sidev faces of the web, as seen particularly in Figure 8. The space 4 at the forward end of the section A readily permits the proper positioning of the posts 7, eachof which posts 7 is provided at its inner or bifurcated end 8 with a suitable screw 9 adapted for binding engagement with the heating element hereinafter described for detachably securing the heating element or unit in electrical engagement with the posts 7. It might also here be stated that the web 2 is provided approximately centrally at its rear end with a threaded recess 10, indicated by dotted lines in Figures 5 and 6, for purposes shortly appearing.

vThe other and co-operating section B of the housing or casing comprises a pair of oppositelyadisposed longitudinal wall members 1 111, adapted, when the sections A and B are in interlocking operative position, to complete with the walls 1 of the section A the cylindrical formation of the housing or casing, an end wall 12 integral with and connecting the rear ends of the walls 11, and a ring 13 integral with and connecting the forwardends of the walls 11. As seen es pecially in Figure 9, rear end wall 12 of section B is provided also approximately centrally with an aperture 14 adapted to register when the sections A and Bare operatively fitted together with the recess 10 of section A.

The heating-unit or element proper C is substantially, as seen particularly in Figure 2, in the form of an elongated U and comprises a pair of substantially U-shaped metallic cover sheets or sections 15-16 disposed in spaced relation one within the other. Disposed between the cover-sections l516 is an insulation core 17, arranged in suitable strands upon which and throughout its length, as shown, is resistance wire 18. As seen especially in Figures 1, .2, and 3, the core 17 so bearing the resistance wire 18 projects at its ends outwardly beyond the ends of the cover-sections 1'516, and folded upon the projecting ends of the core 17 to extend substantially flatwise upon both sides thereof in electrical engagement with the resistance wire 18, and with their ends or legs disposed between the cover-sections 1516, as shown, are folded or bent sections 19 of copper or other suitable conducting material adapted to provide or form flat or blade terminals for the heating element or unit. Also disposed between the cover-sections 1516 and separating the resistance wire 1.8 and its terminals 19 therefrom, to prevent short circuiting, are strips of mica or other suitable insulation material 20. Outer coversection 15 is suitably formed or provided with lateral tongues 21, which are bent or crimped around and upon the inner coversection 16, and the several parts of the heating-unit or element, together with its terminal-sections 20, firmly secured operatively together in fixed relation in a. most simple, but efficient manner. At its bight, the heating-element or unit C is provided with a suitable aperture 22 of somewhat greater diameter than the diameter of the aperture 14 and recess 10 of the housing sections B and A, respectively.

The heating-unit or element 0 is. of a length and width relatively to'its casing or housing-sections A and B to neatly fit in the longitudinal and end recesses 3 and 5 of the housing-section A, the unit C, when fitted into the housing-section A straddling the web 2 and when so fitted in and upon the housing-section A, its terminals 20 enter and are conveniently accommodated by the bifuracted inner ends 8 of the terminal-posts 7. Manipulation of the binding-screws S), easily then accomplished, serves to conveniently detachably secure the unit electrically to the binding-posts 7. The co-operating housing-section B is then slidably fitted upon the section A to enclose the heating-unit Q and when so fitted in co-operating position upon the section A, its ring 13 abuts against the inner marginal face of disk 6, its rear wall 12 is also accommodated by the end recess 5 of section A, and its side walls 11 fit neatly between, and interlock with, the walls 1 of section A, as illustrated in Figure 10. A screw or the like then passed or inserted through the apertures 1e and 22 of -housing-section B and heating-unit G into the recess 10 of housing-section A serves to conveniently secure the housing-sections and heating-unit detachably together. lVith the heating-unit C so housed in and between the co-operating and interlocking housing-sections A and B, it will be seen that the inter-fitting and complementing housingwalls 1 and 11 and the web 2 provide quite extended surfaces for conducting and radiating from the heater the heat generated on the passage of current through the resistance wire 18. On removal. of the securing screw or other retaining member for the housing-sections, the housing-sections may be readily separated and a renewal or substitution of the heating-element or unit may be quickly and conveniently had, as will be evident, without the engagen'ient or discu gagement of wires and the like. The main casing or housing sections A and B, being of metal, are exceedingly durable, but it will also be evident that repair or replacement thereof may be conveniently made whenever necessary or required.

My electric heater is adapted for use in connection with many n'iachines, devices, and the like, and as showing one application or use of the heater, I have illustrated the same in Figure 5 in connect-ion with an ironing device commonly known as a treeing-iron employed particularly in the manufacture of boots and shoes. In this device, its bodymember 23 is formed or' provided longituoinally with an enlarged recess, in which the heater, as shown, is adapted to lit with the ring 13 of its housing-section B abutting against the outer face of the adjacent endwall of the body-member 23, the said recess in the body-member 23 being preferably open at its said end and closed at its other end, as at 24. Abutting at one end also against the said end-wall of the body-member 23 and enclosing and concealing the projecting end of the heater and its binding-posts 7, is a short tubular section or shell 25. Fitting the other end of the shell 25 and attached to the heater as by screws 26, is a circular plate or disk 27. Having suitable rigid engagement with the plate or disk 27, is a handle 28 suitably bored to accommodate the line-wires 2929 of the circuit, which wires are extended through the handle 28 and electrically connected to the binding-posts 7, as shown, the electrical connection between the heater and the circuit being thus concealed and protected. T he other or opposite handle of the ironing-device is suitably provided longitudinally with a screw 31, which is threaded through the closed end 24 of the body-mem- 7 her 23 and into the heater-sections and unit, the handle 30 being thereby secured to the body-member 23 and the housing-sections and unit of the heater also held operatively together, as before described; .I have found from use and experience that the heat rad 'stitution of the heating-element or unit conveniently had, also as before described.

I am aware that changes in the form, construction, arrangement, and combination of the several parts of'my heater may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. An electric heater including a heat radiating casing composed of a pair of cooperating sections each having a pair of spaced connected walls, the walls of one section inter-fitting with the walls of the other section to enclose the heating element of the heater, and the outer faces of the walls of one section complementing the outer faces of the walls of the other section to form the outer surface of the casing.

2. An electric heater including a pair of co-operating sections having spaced walls, one of the sections being movable longitudinally relatively to, and adapted for engage ment with, the other section, and the walls of the one section being adapted to fit between and complement the walls of the other section, to form an enclosing chambered heat-radiating casing for the heating-element of the heater.

3, An electric heater including a pair of co-operating sections having spaced walls one of the sections being movable longitudinally relatively to, and adapted for engagement with, the other section, and the walls of the one section being adapted to fit between and complement the walls of the other section, to form an enclosing chambered heat-radiating casing for the heating-element, one of the sections having a part disposed Within the other section when the members are in complementing position and p rovidinga heat-conducting support for the heating-element.

4. An electric heater including a pair of co-operating sections having spaced, walls arcuated upon their outer face, one of the sections being movable longitudinally relatively to, and adapted for engagement with, the other section, and the walls of the one section being adapted to fit between and complement the walls of the other section, to form a cylindrical enclosing chambered heat-radiating housing for the heating-element, one of the sections having a part disposed within the other section when the members are in complementing position and providing a heat-conducting support for the heating-element.

5. An electric heater including a section having a pair of spaced web-connected walls arcuated upon their outer face, and a second section having a pair of spaced walls also arcuated upon their outer face and connected at one end by a ring, the first section being movable within the ring and between the walls of the second section, and the walls of the first section being adapted to complement the walls of the second section, to form a cylindrical enclosing chambered heat-radiating housing for the heating element of the heater, the web of the first section being disposed within the second section when the members are in complementing position and providing a heat-conducting support for the heating-element.

6. An electric heater including an elongated section provided with terminals adapted for electrical connection with the wires of a circuit, in combination with a heatingelement adapted to fit as a unit upon the section and for electrical connection with the terminals.

'7. An electric heater including an elongated section provided with terminals adapted for electrical connection with the wires of a circuit and comprising a pair of spaced connected walls, in combination with a heating-element adapted to fit as a unit between the walls and for electrical connection with the terminals.

8. An electric heater including, in combination, a section provided with terminals adapted for connection with the wire of a circuit and comprising 'a pair of spaced walls and a connecting web bet-ween the walls, and a heating-element adapted to fit upon the-web and between the walls and for electrical connection with the terminals.

9. An electric heater including a casingsection comprising a pair of spaced walls,

a connecting web between the walls, a disk fixed to and at an end of the walls, and ter minals on the disk adapted for electrical connection with the wires of a circuit, in combination with a heating-element adapted to fit upon the web and between the walls and for electrical connection with the terminals.

10. An electric heater including a casing-section comprising a pair of spaced walls, a connecting web between the walls, a disk fixed to and at an end of the walls, and terminals on the disk adapted for electrical connection with the wires of a circuit, in combination with a heating-element adapted to fit upon the web and between the walls and having blade-terminals adapted for electrical connection with the terminals of the section,

11. An electric heater including a casingsection comprising a pair of spaced walls, a connecting web between the walls, a disk fixed to and at an end of the walls, and bit'nrcated terminals on the disk adapted For electrical connection with the wires of a circuit, in combination with a heatingeleinent adapted to fit upon the web and between the walls and having bladeterminals adapted for electrical connection with the terminals of the section.

12. An electric heater including a casingection comprising a pair of spaced walls, a connecting web between the walls, a disk fixed to and at an end of the walls, and bifurcated terminals on the disk adapted for electrical connection with the wires of a circuit, in combination with a U-shaped heating element adapted to fit upon the web and between the walls and having bladeterminals adapted for electrical connection with the terminals of the casing-section 13. An electric heater including a casingscction comprising a pair of spaced walls, a connecting web between the walls, a disk fixed to and at an end 01": the walls, and bifurcated terminals on the disk adapted for electrical connection with the wires of a circuit, in combination with a U-shaped heating element adapted to fit upon the web and between the walls and having blade terminals adapted for electrical connection with the terminals of the casing-section, and a EBCOIlCl casingsection comprising also a pair of spaced walls and a ring connecting said walls, said section being slidable upon, and the walls thereof being adapted to com- .plement the walls or", the first section to enclose the heating element.

14. An electric heater including, in combination, a casing-section comprising a pair of spaced walls, a connecting web between the walls, a disk fixed to and at an end of the walls, and bifurcated terminals on the disk adapted for electrical connection with the wires of a circuit, a U-shaped heating element adapted to fit upon the web and between said walls and having blade terminals adapted for detachable electrical connection with the tern'nnals of the casing-section, and a second casing-section comprising a pair of spaced walls, a cross-piece connecting said walls at one end, and a ring connecting said walls at their other end, said second section being slidable upon, and the walls of the second-section be ing adapted to complement the walls of, the first section to enclose the heating-element, and means adapted for engagement with said cross-piece and web for detachably securing said sections together.

15. An electric heater including a separable casing comprising interlocking sections disposed approximately in parallel relation, in combination with an electric heating-element enclosed by said sections, said sections being separable from each other to expose the heating-element.

'16. An electric heater including a separable casing comprising interlocking sections having spaced wallsdisposed approximately in parallel relation, in combination with an electric heating-element enclosed by said sections, the walls off one section fitting between the walls of the other section and said sections being endwise separable from each other to expoce the heating-element, and means for retaining the sections in interlocking engagement with each other.

17. In an electric heater, a separable casing comprising interlocking sections, each of said sections being closed at one end and open at the other to receive the heating element, one of said sections having a longitudinal recess for the heating element and the other section being positioned to form a closure for said recess, and means for re taining said sections ininterlocking engagement with each other.

18. In an electric heater, a casing section provided with a longitudinal recess, an electrical heating elementremovably mounted in said recess, a second casing section slidable longitudinally of the first section to form a closure for said recess, said sections being adapted to removably interlock with each other, and means for releasably retaining said sections in interlocking engagement with each other.

19. In an electric heater, a casing-section provided with a longitudinal recess, an electrical heating element removably mounted in said recess, a second-casing section slidable longitudinally of the first section to form a closure for said recess, said sections being adapted to removably interlock with each other, each of said sections being closed at one end and open at the opposite end to receive the heating element, and removable means for retaining said sections in inter locking engagen'ient with each other.

20. In an electric heater, a separable casing comprising a pair of interlocking sections, each of said sections having an end wall member and oppositely disposed longitudinal wall members, an electrical heating element interposed between the longitudinal wall members of both sections, each of said sections being primarily open at one end and open between its longitudinal wall members to receive the heating element, the longitudinal wall members of each section being inter ocked with and mounted between the longitudinal wall members of the other section, so as to enclose the interposed heating element, one of said sections being movable longitudinally of the other to open the housing and to expose the heating element, and means for removably securing said sections in interlocking engagement with each other.

21. In an electric heater, a separable cylindrical casing comprising a pair of interlocking sections, each of said sections having an end wall member and a pair of oppositely disposed elongated longitudinal wall members, one of said sections being approximately H-shaped in cross-section so as to provide oppositely disposed longitudinal recesses between its wall members, an approximately U-shaped heating element rcmovably mounted in said recesses and interlocked with the last mentioned section, the other section being interlocked with the heating element and being mounted in said recesses to forma closure therefor, and a screw passing through the end wall of the last mentioned section and into the web of the other section to retain said sections in inter locking engagement with each other.

22. In an electric heater, a separable ing comprising a pair of interlocking tions, each of said sections having an end wall member and a pair of oppositely disposed longitudinal wall members and each of said sections being open at the end opposite its end wall member, one of said sections having a longitudinal web connecting its longitudinal wall members to provide oppositely disposed longitudinal recesses, said longitudinal web being shorter than said longitudinal wall members so as to provide an end recess at the open end of the last mentioned section, an approximately U- shaped heating element arranged in said recesses and straddling said longitudinal web, said heating element being interposed between the longitudinal walls of the last mentioned section, the end and longitudinal walls of the other section being arranged in said end and longitudinal recesses to form closures therefor, and a connecting screw passing through the last mentioned end wall and extending across said end recess, said longitudinal web being threaded to receive said connecting screw.

23. In an electric heater, a heating-element comprising a pair of cover-sections disposed in approximately parallel relation one within the other, an electrical heatradiating member interposed between and insulated from said cover-sections, means for securing the cover-sections together in enclosing relation about said member, the element as a whole being U-shaped in side elevation with its legs at their free ends spaced apart for endwise straddling a supporting-member, and terminals for and upon the element at the free ends of its said legs.

24. In an electric heater, a heating element comprising a pair of U-shaped metal cover sections, one of which is arranged within the other, an electrical heat radiating member interposed between and insulated from the cover sections, the terminals of said electrical heat radiating member being at the ends of the il-shaped structure, and marginal tongues formed integral with the cover-sections, each of said tongues being extended from one of the cover sections and bent onto and clinched upon a margin of the other cover section.

25. In an electric heater, a heating-element comprising a pair of metal cover-sections disposed in approximately parallel relation one-within the other, a core, resistance-wire disposed in strands upon the core, the core and wire beingdisposed between and insulated from the cover-sections, means for securing the cover-sections in enclosing relation about the core and wire, the heating element as a whole being U-shaped in side elevation with its legs at their free ends spaced apart for endwise straddling a supporting-member, and terminals disposed at the ends of the core in electrical connection with the wire and projecting outwardly be yond the free ends of the element.

:26. An electric heater including a heating element comprising a core, resistance wire disposed in strands upon the core, a flat strip of conducting material folded to eX- tend upon opposite sides of the core at an end thereof to form a blade-terminal for the element, and means for securing the strip and wire electrically together.

27. An electric heater including a heating element comprising a pair of cover sheets, a core, resistance wire disposed in strands upon the core, the core and wire being disposed between the coversheets and projecting beyond the ends of the cover-sheets, flat strips of conducting material folded to extend upon opposite sides of the core at the projecting ends thereof and adapted to form blade terminals for the wire, and means on the cover sheets for securing the parts to gether and the strips in electrical engagement with the wire.

28. An electric heater comprising a chambered heat-radiating casing composed of a plurality of co-operating sections having. spaced walls, the walls of one section fitting separably between the walls of the other section and one of the sections being provided with line-terminals having portions disposed within the casing, in combination with a heating-element adapted to fit as a unit within the casing and having terminals adapted for electrical connection within the casing with the terminals of the casing.

29. An electric heater comprising a chambered heat-radiating casing composed of a plurality of cooperating sections having spaced walls, the wall of one section fitting separably between the walls of the other section and one of the sections being provided with terminal-posts disposed within the casing adapted for electrical connection with the wires ot'a circuit, in combination with a heating-element adapted to lit within the casing and having terminals adapted for electrical connection within the casing the casing and having blade terminals adapted to electrically tit the forked portions or the posts.

31. An electric heater comprising; a chambered heat-radiating casing composed of a plurality of co-operating sections, one of the sections being provided with terminalposts adapted for electrical connection witl the wires of a circuit and having bifurcated portions disposed within the casing, in combination with a heating element adapted to fit within the casing and having bade terminals adapted to fit the bifurcated portions of the posts, and means on the bifurcated portions of the posts adapted for engag nen with the terminals of the heating-cit nent to secure the same electrically to the posts.

32 An electric heater comprising a chambered heat-radiating casing composed ot a plurality of separable sections, one of the sections belngprovlded with; terminal posts adapted for connection with the wires of a circuit and having bifurcated portions disposed within the casing, in combination with a renewable heating-element adapted to lit within the casing and having blade terminals adapted to removably fit the bifurcated portions of the posts, and means on the bifurcated portions of the posts adapted for detachable engagement with the terminals of the heating-element to releasably secure the same electrically to the posts.

33. The combination with an ironing device or the like equipped with wires adapted for electrical connection with a source of current supply, the body of the device being recessed, in combination with an electricbeater including a heat radiating casing termed 0t co-operating separable sections adapted for movement endwise relatively to each other and having inter-fitting walls, the casing being disposed within the recess of the body, and having termina's adapted for electrical connection with said wires, and.

a heating-element housed within the casing and having electrical engagement with said terminals, and a member forming part of the device for concealing the electrical connection between the terminals and the wires.

In testimony whereof, I have signed my name to this specification.

EDGAR MILLNER. 

